Heritage search Facebook for groups in your local area on Facebook. There are local group pages with things for sale, mother and toddler, local interest, village pages, dogging

and much more...
If you can get you other half or you to join the groups then post on the group page with a link to your website, with offer for members or a recommendation. I say other half as most of these groups are used by women and a post from a woman member works/looks better. I have my other half doing for me and it does work.
Also another way is to get your local friends and family to post the link for your website with a glowing recommendation for your service on there news feed. This also does work but assumes that you have a few local friends and family.
Getting people to like your business page is good but is not really going to get the phone to ring unless they are local.
Another Facebook ploy is to create an account in your business name. Against Facebook rules but there are plenty doing it. Then make friends with as many other local businesses you can find and you will find 100's and then when you make a post your post will appear on there news feed. Offer special rate for commercial cleaning. Again this does work.
Social media can work and is free apart from your time and you are only limited by time and imagination.